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An electric servo brake system applied for use on electric vehicles was applied for use on plug-in hybrid vehicles in order to achieve fuel-savings together with good brake feel and enhanced operability for plug-in hybrid vehicles. The electric servo brake system is made up of highly accurate braking pressure control that functions cooperatively with regenerative brakes together with a structure in which pedal force is not influenced by braking pressure control. The configuration of these components enabled good braking feel even when the power train was being switched from one drive mode to another. Automated pressurization functions that are intended for plug-in hybrid vehicles and that operate with electric servo brake systems were also developed. These developed functions include stall cooperative control that functions cooperatively with the power train, regenerative coordinate adaptive cruise control, and hill-start assist.

This paper discusses research on a tire force sensor for use in vehicle dynamics control, and its application in the system. Tire forces are an important factor in determining vehicle dynamics. Direct measurement of tire forces in real time and the use of these measurements in vehicle dynamics control could therefore be expected to result in enhanced vehicle dynamics. It is desirable for a sensor used in vehicle dynamics control to be easily mounted in a vehicle. Therefore we focused on brake torque, one of the forces acting on the tire, and conducted research on a sensor for use in vehicle dynamics control system that is suitable for vehicle mounting and also is able to conduct accurate real-time measurements of brake torque. The application of brake torque in vehicle dynamics control was shown to reduce braking distance and enhance stability and avoidance performance.